Display device

Patent metadata

Field	Value
Publication number	US-11195885-B2
Application number	US-202016835870-A
Country	US
Kind code	B2
Filing date	Mar 31, 2020
Priority date	Jun 7, 2019
Publication date	Dec 7, 2021
Grant date	Dec 7, 2021

Abstract

A display device includes: a first substrate; a second substrate on the first substrate; a pixel between the first substrate and the second substrate and including a pixel area and a non-pixel area around the pixel area; a color filter between the pixel and the second substrate and overlapping with the pixel area; and a plurality of protrusions between the second substrate and the color filter, and each of the protrusions has a width that decreases as a distance from the second substrate increases.

First claim

What is claimed is:

1. A display device comprising:
a first substrate;
a second substrate on the first substrate;
a pixel between the first substrate and the second substrate and comprising a pixel area and a non-pixel area around the pixel area;
a color filter between the pixel and the second substrate and overlapping with the pixel area; and
a plurality of protrusions between the second substrate and the color filter, wherein each of the protrusions has a width that decreases as a distance from the second substrate increases,
wherein the pixel area is a single light-emitting region extended continuously along a direction from a first portion of the non-pixel area to a second portion of the non-pixel area that is adjacent to the first portion along the direction, and
wherein the protrusions overlap the single light-emitting region, do not overlap the non-pixel area, and are separated from each other.

2. The display device of claim 1 , wherein the protrusions are arranged in a first direction and a second direction crossing the first direction.

3. The display device of claim 1 , wherein the color filter is arranged on a lower surface, which faces the first substrate, of the second substrate to cover the protrusions.

4. The display device of claim 3 , wherein an upper surface of each of the protrusions facing the lower surface of the second substrate has a width of about 100 nm to about 200 nm.

5. The display device of claim 4 , wherein a distance between an upper end and a lower end of each of the protrusions with respect to a direction perpendicular to the lower surface of the second substrate is about 200 nm to about 500 nm.

6. The display device of claim 1 , wherein a distance between a center portion of a h-th protrusion among the plurality of protrusions and a center portion of a (h+1)th protrusion among the plurality of protrusions is about 200 nm to about 500 nm, where h is a natural number.

7. The display device of claim 1 , wherein each of the protrusions has an inverted triangular shape.

8. The display device of claim 1 , wherein each of the protrusions has a refractive index of about 1.45 to about 1.55.

9. The display device of claim 1 , wherein each of the protrusions comprises an organic material.

10. The display device of claim 1 , wherein each of the protrusions has a same refractive index as the second substrate.

11. The display device of claim 1 , wherein each of the protrusions has a refractive index smaller than a refractive index of the color filter.

12. The display device of claim 1 , further comprising:
a light conversion layer between the pixel and the color filter; and
a black matrix overlapping with the non-pixel area, wherein each of the pixel, the color filter, and the light conversion layer is provided in plural.

13. The display device of claim 12 , wherein the pixel area of each of the pixels comprises a light emitting element to generate a first light, and the light conversion layers comprise:
a first light conversion layer to convert the first light to a second light;
a second light conversion layer to convert the first light to a third light; and
a light transmission layer to transmit the first light.

14. The display device of claim 1 , wherein the protrusions extend in a first direction and are arranged in a second direction crossing the first direction.

15. The display device of claim 1 , wherein each of the protrusions has an inverted trapezoidal shape.

16. The display device of claim 1 , wherein each of the protrusions comprises:
a first portion having a quadrangular shape; and
a second portion elongated in a direction away from the second substrate from a lower portion of the first portion and having an inverted triangular shape.

17. The display device of claim 1 , wherein each of the protrusions has a curved shape that is convex in a direction away from the second substrate.

18. A display device comprising:
a first substrate;
a second substrate on the first substrate;
a pixel between the first substrate and the second substrate and comprising a pixel area and a non-pixel area around the pixel area;
a color filter between the pixel and the second substrate and overlapping with the pixel area; and
a plurality of protrusions between the second substrate and the color filter, wherein a width of an upper end of each of the protrusions, which faces the second substrate, is larger than a width of a lower end of each of the protrusions,
wherein the pixel area is a single light-emitting region extended continuously along a direction from a first portion of the non-pixel area to a second portion of the non-pixel area that is adjacent to the first portion along the direction, and
wherein the protrusions overlap the single light-emitting region, do not overlap the non-pixel area, and are separated from each other.

19. The display device of claim 18 , wherein each of the protrusions has a width that decreases in a direction away from the second substrate.

20. The display device of claim 18 , wherein the color filter is arranged on a lower surface, which faces the first substrate, of the second substrate to cover the protrusions.

Assignees

• Samsung Display Co Ltd

Inventors

• Lee Gak Seok
• Kim Byung-Chul
• Kim Inok
• Seong Jaemin
• Song Inseok
• Oh Keunchan
• Jang Jieun
• Jang Chang-Soon
• Joo Sun-Kyu

Classifications

• H10K59/8792

  comprising light absorbing layers, e.g. black layers · CPC title

• H10K59/87

  Passivation; Containers; Encapsulations · CPC title

• H10K59/35

  comprising red-green-blue [RGB] subpixels · CPC title

• H10K59/879 Primary

  comprising refractive means, e.g. lenses · CPC title

• H10K59/12

  Active-matrix OLED [AMOLED] displays · CPC title